Like captainpooby said,it was only at LaGuardia:
[url]http://wireservice.wired.com/wired/story.asp?section=Breaking&storyId=809130&tw=wn_wire_story[/url]
Wednesday, December 24, 2003 6:41 p.m. ET
NEW YORK (Reuters) - The Delta Airlines terminal at New York's LaGuardia Airport was evacuated at about 5:40 p.m. on Wednesday and all departing Delta flights were grounded for security reasons, the Port Authority of New York and New Jersey said.
A Port Authority spokesman told Reuters the action was ordered by the Transportation Security Administration. He said no other details were immediately available and the grounding would continue until further notice.
A TSA spokeswoman told local radio that a woman passenger set off a metal detector and entered the airport without getting a second screening. Authorities were searching for the passenger, one local radio station said.